[2022] P7 Zamorak, Step Into The Dark, Bug or Mechanic?

During some of my testing, I came across a moment where I wiped myself on the P7 Runes, where I accidently mis-clicked and ran my alt through a symbol. I entered P7 at the exact same moment I received the symbols from Into The Dark. It's difficult to be sure, as it was only a glance, but the message that I believe came up was "touched the wrong rune", hitting me for the usual damage, and I'm quite certain I saw the health bar of the rune go full red with an uber heal. This wasn't the rune I was previously attacking.

Two questions: I can't recall the message you receive when accidentally blowing up the wrong rune in P7, though I assume it's not the same message?

If it is not the same message - I expect this is a bug?

I'm quite certain I didn't overkill a different rune, though it was all a very brief moment and I didn't record it sadly.

There are a few strange bugs I've encountered, one is that Zamorak can become literally invulnerable, permanently.